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4. A research firm conducted a survey to determine the mean amount of steady smokers spend on cigarettes during the week. They found the distribution of amounts spent per week followed a normal distribution with a population standard deviation of $5. A sample of 64 smokers revealed a sample mean of $20.

A) Construct a 95% and 99% confidence interval for the population mean.

B) Would it be reasonable to conclude that the population mean is $22?

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Joshua Stredder
Joshua StredderLv10
28 Sep 2019

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